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nikic/gist:4162505

Created November 28, 2012 16:55
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Regex to validate (IPv4) CIDR notation (with capture)
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gistfile1.txt
\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)/(3[0-2]|[1-2]?[0-9])\b
\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.((?1))\.((?1))\.((?1))/(3[0-2]|[1-2]?[0-9])\b
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